Revert "Revert "spec: Suppress the test that destroys WebContents in event listener""

This reverts commit 210652ed54.

spec/api-web-contents-spec.js

@@ -590,6 +590,12 @@ describe('webContents module', function () {
   })
 
   describe('destroy()', () => {
+    // Destroying webContents in its event listener is going to crash when
+    // Electron is built in Debug mode.
+    if (process.platform !== 'darwin') {
+      return
+    }
+
     let server
 
     before(function (done) {